(57) The invention concerns a heterocycle of the formula I
wherein Q is an optionally substituted 6-membered monocyclic or 10-membered bicyclic
heterocyclic moiety containing one or two nitrogen atoms;
A is (1-6C)alkylene, (3-6C)alkenylene, (3-6C)alkynylene or cyclo(3-6C)alkylene;
X is oxy, thio, sulphinyl, sulphonyl or imino;
Ar is phenylene which may optionally bear one or two substituents or Ar is an optionally
substituted 6-membered heterocyclene moiety containing up to three nitrogen atoms;
R¹ is hydrogen, (1-6C)alkyl, (3-6C)alkenyl, (3-6C)alkynyl, cyano-(1-4C)alkyl or (2-4C)alkanoyl,
or optionally substituted benzoyl;
and R² and R³ together form a group of the formula -A²-X²-A³- which, together with
the carbon atom to which A² and A³ are attached, defines a ring having 4 to 7 ring
atoms, wherein A² and A³, which may be the same or different, each is (1-4C)alkylene
and X² is oxy, thio, sulphinyl, sulphonyl or imino;
or a pharmaceutically-acceptable salt thereof.
The compounds of the invention are inhibitors of the enzyme 5-lipoxygenase.
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